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Accurate DNA Synthesis Across 8-Oxoadenine by Human PrimPol.

Elizaveta O Boldinova1,2, Alexander A Kruchinin1,2, Polina N Kamzeeva1,3

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PrimPol, a DNA primase and polymerase, efficiently bypasses 8-oxoadenine DNA lesions. This enzyme shows higher accuracy on 8-oxoadenine than 8-oxoguanine, aiding DNA repair.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • PrimPol is a human enzyme with DNA primase and polymerase functions.
  • It plays a crucial role in DNA damage tolerance and restarting stalled replication forks.
  • PrimPol exhibits DNA translesion synthesis (TLS) activity, bypassing various DNA lesions.

Purpose of the Study:

  • To investigate the TLS activity of PrimPol on 8-oxoadenine (8-oxoA), a common oxidative DNA lesion.
  • To compare the accuracy of PrimPol on 8-oxoA versus 8-oxoguanine (8-oxoG).
  • To explore the effect of divalent metal ions (Mg2+ vs. Mn2+) on PrimPol activity and mechanism.

Main Methods:

  • In vitro biochemical assays to assess PrimPol's DNA synthesis and bypass activity.
  • Site-directed mutagenesis and enzyme kinetics to study enzyme mechanism.
  • Analysis of DNA lesion bypass efficiency and fidelity.

Main Results:

  • PrimPol demonstrates efficient and accurate TLS activity across 8-oxoadenine.
  • The enzyme's accuracy on 8-oxoA is significantly higher than on 8-oxoguanine.
  • Manganese ions (Mn2+), compared to magnesium ions (Mg2+), stimulate PrimPol activity on 8-oxoA and 8-oxoG via a lesion skipping mechanism.

Conclusions:

  • PrimPol possesses robust TLS activity against 8-oxoadenine, a key oxidative DNA lesion.
  • The enzyme's higher fidelity on 8-oxoA contributes to maintaining genomic integrity.
  • PrimPol's activity is modulated by metal ions, suggesting a flexible mechanism for lesion bypass.